Box Contents - MM 100 headset, USB charging cable, Wall adapter Wireless freedom with Stereo A2DP Bluetooth - hands-free convenience and hi-fi stereo sound Outstanding Sennheiser sound via the Open-Aire acoustics Open acoustics deliver a wide dynamic range with detailed and natural sound reproduction Discrete, invisible microphone is always out of the way. Refurbished to new condition with Sennheiser warranty. The MM 100 Bluetooth stereo headset lets you enjoy music and never miss a call - all from your multimedia-capable mobile phone. The MM 100 is a direct route to Sennheiser sound quality when listening to music or holding a conversation. The lightweight neckband style is perfect for evening walks, stomping the streets or just relaxing in the park without getting tangled up in a cord. Convenient controls for adjusting volume and skipping forward/back in a playlist (on devices supporting the AVRCP profile) are discrete yet easy-to-use without taking the headset off. The answer/end button lets you take a call, hands-free, anytime. A convenient USB charger (with wall adapter) is supplied in the box. The Open-Aire acoustics provide incredible detail and sound imaging well-worthy of the Sennheiser name. The open system also keeps you in tune with your environment. Neckband style is ideal for your on-the-go lifestyle Easy-to-use controls are within reach and provide concise click feedback Soft cushions deliver excellent wearing comfort for long-term use Flexible charging - rechargeable via supplied USB or wall adapter Connect to any Bluetooth audio capable device 2-year international warranty Specifications - Wearing style - On-the-ear, neckband Transducer principle - Open-Aire Technology - Bluetooth 2.0 + EDR / supported profiles - A2DP + AVRCP + HSP + HFP Talk time - Up to 9 hours Listening time - Up to 7.5 hours Charging time - Approximately 2.5 hours Standby time - Up to 220 hours Range - Up to 33 ft Frequency response (headphones) - 22 - 20,000 Hz Total harmonic distortion (THD) - < 0.2% (1 kHz) Frequency response (microphone) - 100 - 10,000 Hz Pick-up pattern - Omni-directional Dimensions (single) - 7.5 x 8 x 2.75 inches |